United States Department of Transportation
i
An Evaluation of Existing Tire Pressure Monitoring Systems
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2001-07-01
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[PDF-2.33 MB]
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TRIS Online Accession Number:00819643
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NTL Classification:NTL-SAFETY AND SECURITY-Vehicle Design;NTL-SAFETY AND SECURITY-Highway Safety;NTL-LAWS AND REGULATIONS-Federal Standards and Rules;
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Abstract:In the TREAD Act of November 1, 2000, Congress required the National Highway Traffic Safety Administration (NHTSA) to develop a rule requiring all new light vehicles to be equipped with a warning system to indicate to the operator when a tire is significantly underinflated. In response to this requirement, NHTSA undertook an evaluation of existing original equipment manufacturer (OEM) and aftermarket tire pressure monitoring systems (TPMS). Based on this evaluation, NHTSA will determine the minimum system performance criteria that are technically feasible and provide the most useful information to the driver for preventing unsafe conditions. Through its testing, NHTSA found that systems that use sensors to directly measure tire pressure (pressure-sensor based systems) were better able to detect underinflation, had more consistent warning thresholds, and were quicker to provide underinflation warnings than the systems that infer tire pressure from monitoring wheel speeds (wheel-speed based systems. Wheel-speed based systems were found to be easier to maintain since there are no battery life concerns and the fact that sensors are not exposed to tire mounting and roadway hazards. An examination of driver interfaces for existing TPMS showed significant variation in methods of visual warning presentation. The variation in visual warning presentation demonstrated the need for standardization of the visual warnings of tire underinflation to avoid driver confusion. Tables, figures, references, appendices. 2373k, 161p.
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